Adding machine



May 5, 1942. c. H. BRADT 4 ADDING MACHINE Filed Nov. 2, 1939 4 Sheets-Sheet l ATTORNEY C. H. BRADT ADDING MACHINE May 5, 1942.

Filed Nov. 2, 1939 4 Sheets-Sheet 2 mmv ,WEG

NWN

n ATTORNEY May 5, 1942.2 QH. BRADT 2,281,742

ADDING MACHINE Filed Nov. 2, 1939 4 Sheets-Sheet 4 ATTORNEY Patented May 5, 1942 UNITED STATES PATENT @FFiE ADDING MACHINE Application November 2, 1939, Serial No. 302,505

(Cl. 23S- 60) 3 Claims.

Important objects of the present invention are to provide, in a key-set adding and recording machine, an improved keyboard and improved mechanism controlled thereby for recording transaction items 0r details in addition to recording transaction amounts; and to provide very simple and compact mechanism for said purpose.

Other objects of the invention will appear hereinafter.

In the drawings, Fig. 1 is a side elevation of an adding machine embodying the invention;

Fig. 2 is a vertical longitudinal section on the line 2-2 of Fig. 6, the section including the entire length of the machine;

Fig. 3 is an enlarged vertical transverse section approximately on the line 3-3 of Fig. 2;

Fig. 4 is a detail perspective view of certain elements of the machine forming part of the invention;

Fig. 5 is a detail sectional view showing the means for limiting accumulating rotation of one of the register pinions;

Fig. 6 is a top plan view of the keyboard and certain associated elements of the machine;

Fig. 7 is a rear view of the recording types of the machine;

Fig, 8 is a front elevation of the adding sector racks, the register pinions and associated parts, certain of said parts being in section;

Fig. 9 is a vertical longitudinal section on the line 9-9 of Fig. 6;

Fig. 10 is a vertical longitudinal section on the line lil-I0 of Fig. 6;.and

Fig. l1 is a detail section on the line II--II of Fig. 10.

The invention is illustrated as embodied in a portable adding machine of the type known commercially as the Corona adding machine, the construction and operation of which are substantially as shown and described in Barrett Patent No. 1,811,846 of June 30, 1931. In the present drawings machine parts corresponding to those disclosed in said patent are correspondingly numbered.

The machine has a main frame including a base plate i and upstanding side plates 5 and 6 rigidly secured in a fixed relation to each other and to the base plate. Said side plates support the entire mechanism of the machine, with the exception of the ribbon mechanism. A cover casing 8 encloses most of the machine and has the ribbon mechanism mounted thereon. The ribbon mechanism is indicated only in Fig. 1

and is designated R. A bracket for supporting a roll of paper P is mounted upon the rear side of the cover casing.

A keyboard unit extends between the upper forward margins of the frame side plates 5 and 6 and is supported thereon in a rearwardly and upwardly inclined position. rlhe unit includes a frame comprising a top plate I2 and depending side plates i5. These side plates have apertures through which removable transverse rods I6 are passed to removably secure the unit in place.

The keyboard includes keys for recording a number of items and details of different transactions, There are keys for the commodity sold, keys for the quantity of the commodity sold, keys for the cash amount involved in the sale and keys for different clerks or salesmen. All of these different kinds of keys are conveniently and compactly arranged in the keyboard.

In the present instance the keyboard includes a right-hand bank of amount keys I8 and a lefthand bank of amount keys l8a. Said banks are spaced apart across the keyboard and each bank includes a plurality of rows or columns of keys numbered in each column from 1 to "9. In the present instance there are four columns of keys in the right-hand bank and three columns in the left-hand bank. All of said .keys of both banks are both recording or listing keys and accumulating keys. At the lower end of each column there is also a key |81. This key may be a zero key, but in the present instance it serves merely as a correction key to restore to -normal position any key of an associated column which has been erroneously set. Between said banks of keys there is a short column of keys ISc alongside the right-hand bank, and a column of keys IBd alongside the left-hand bank and coextensive with the bank columns. The keys ISC and ltd are recording keys only, They do not controlaccumulation. In the present instance there are three of the keys IBC, marked A, B, and C and they .may be employed to indicate clerks or salesmen in different transactions. Keys I8d are marked to indicate gasoline, oil, grease and other commodities sold. At the lower end of each of the columns of keys I3c and 18d there is also one of the correction keys 18h.

Each of the keys i8 toy Ifd inclusive has a flat stern iii formed at its lower end with a narrow tail or4 stop iinger 20. Some of the keys have the stop finger located centrally of the width of the stem and other keys have the nger offset at one side or` the other of the center so that the stop ngers are in staggered relation along a key column. The upper portions of the key stems are fitted in apertures in the plate l2 and the stop ngers are fitted in apertures'in a narrow plate or strip 22. One of these strips underlies each column of keys and is secured within the frame of the keyboard unit. The respective key stems have elongated central openings 21 through which latch strips 28 extend, the respective latch strips having beveled notches and latch dogs 29, cooperating with a detent 3l] formed in the respective keys by another hole 3l located above the opening 21. The latch strips are mounted within the frame of thev keyboard unit for longitudinal sliding. When a key is depressed the latch strip will be slid toward the front of the machine until the key detent 30 is engaged by the under side of the latch dog 29. In this manner the keys are held in depressed or set position, but if, after a key is depressed, another key is depressed in the same row, the rst key will be released and returned by a spring to normal position, thus forming a flexible keyboard. Springs 33 are provided for restoring depressed keys to normal position. These springs are preferably coiled about rods 34, extending transversely of the rows of keys, between alternate keys of the rows. The ends of the springs extend in opposite directions and project into the holes 3l v in adjacent key stems. Thereby a single spring is adapted to operate two keys.

The undercut notches of the beveled latch dogs 2S are shallow so that When the latch dogs engage the detents or cross bars 30 of the keys, the latch strips 28 will not fully return to their original positions, thereby holding the associated stop levers (3l) hereinafter referred to, out of engagement with the corresponding adding units.

The side plates l of the keyboard unit have rearwardly projecting arms 35 forming the support for a transversely extending shaft 36 lying below the rear ends of the latch strips 23 for supporting a plurality of stop levers 31, pivotally mounted thereon and held in a spaced relation and with their upper ends in position to cooperate with the latch strips 2t. The upper ends 38 of the stop levers 31 lie alongside the rear ends of the latch strips 28 and have laterally projecting ears 40 adapted to engage with the ends of the latch strips, as indicated in Fig. 2. The stop levers 3'! are also provided with fingers 4|, between which and holes 42 in the respective latch strips, double acting springs 43 are connected for holding the ears 40 in contact ywith the ends of the respective latch strips and for moving the latch strips toward the rear to effect latching of set keys or, when no keys are set, the spring will hold the latch strips 28 and stop levers 31 in normal position with the latter in position to engage the stops or detent teeth on the adding units.

The rod or shaft 36, supporting the stop levers 31, forms the pivotal support for a yoke or rock bail 44 adapted to lie immediately hack of the rear ends of the latch strips 28 and to limit the rearward movement of the latter under the action of the springs 43. rBy stop means, disclosed in the aforesaid Patent No. 1,811,340, the bail is held against rearward movement from the position in which it is shown in Fig. 2. Thereby the bail holds the latch strips 23 against rearward movement under the influence of the springs 43.

Bail 44 has rearwardly extending arms 44'l1 pivotally supporting thereon a small auxiliary yoke or rock bail 445. This auxiliary bail is normally held in the position shown in Fig. 2 by a spring i9 (Fig. 6), extending between the bails, and by stop means, disclosed in the aforesaid patent. There is also provision, disclosed inthe aforesaid patent, for operating the latch strip bail 44 to move all of the latch strips forward and thereby release any of the set keys at the end of a return stroke of a general operating handle.

In the repeat operation on machines of this character the number set up on the keyboard is retained while the handle is operated several times to repeatedly add the same number. For this purpose the auxiliary bail 46 is adapted to be moved toward the rear and held in that position for the repeat operation. There is a repeat ,key lever 52 of bell-crank shape pivotally mounted Vas at 53 upon a forwardly extending arm formed with bail 44. A rearwardly extending arm of the repeat key lever is formed with a cam edge 55, which is normally in engagement with the rear edge of the auxiliary bail 45, and a notch 5S located above said cam. The spring 49 connecting the balls 44 and 4E acts on the latter bail to press it against said cam and hold the repeat key lever in the position shown in the` drawings. In that position an upwardly extending arm of the repeat key lever is in engagement with a stop lug 51 formed on said forwardly extending arm of bail 44, upon which the repeat key lever is pivoted. Said upwardly extending arm may be provided with a key cap.

In preparation for repeat operation of the machine the repeat key lever is swung clockwise, with reference to Fig. 2, to cam the bail 46 rearwardly, and lock it by means of the notch 55, and thereby swing a pin 5I borne by the bail 4t (see Fig. 6) out of reach of means disclosed in the aforesaid patent, for rocking the hails 46 and 44 forwardly, as the general operating handle approaches the end of its return stroke. Therefore the bail 44 is not operated to press the latch strips 28 forwardly and release keys which have been set. Consequently a number set up will .be repeatedly printed upon repeated operation of the operating handle. The set keys are manually releasable by swinging the repeat key back to normal position, engaging its upwardly extending arm with the lug 51 on the bail 44 and pulling the lever forwardly to rock said bail, through the medium of the lug 51, and cause the bail to push the latch strips forwardly and release the set keys.

In order to prevent accidental release of set keys by jars or shocks to which they may be sub- `iected, particularly in repeat operations, means are provided to lock the latch strips against keyreleasing movement. Ihe latch strips are provided with notches 59 near their rear ends. A locking bail 6B is provided for engagement with these notches to prevent movement of the latch strips after the operating handle has been started on its forward stroke. Bail Gil is pivotally mounted by arms BI on the ends of the rearmost spring-supporting rod 34. The bail Ihas a downwardly and rearwardly extending arm 62 to cooperate with a pin 63 carried on a lever arm operable by means disclosed in the aforesaid patent. The arrangement is such that in normal position of the operating handle the pin 63 by engaging the lower end of the arm 62 lifts and holds the locking bail out of engagement with the notches 59 in the latch strips thereby permitting the keys to be freely set. After the handle has started and is on its forward stroke, the pin 63 will be moved out of engagement with the arm 62 thus permitting the locking bail 68 to engage the notches of the latch strips and prevent accidental movement thereof.

Adding units are rotatably mounted upon a transverse main shaft 68 to which the main operating handle of the machine is secured. The adding units comprise driver elements 69 carrying type bands 18. The type bands are formed as narrow rolled strips, concentrically mounted on arcuate flanges on the driver elements 69, the type being fixed thereon and adapted to be printed from by movement of a platen against the type. The driver elements 69 of the adding units are provided with upwardly projecting stop lugs 1| to cooperate with ears 12 bent over on the ends of the stop levers 31 which form part of the keyboard unit and are adapted to be positioned by the latch strips 28 when keys in the keyboard are depressed. The arrangement is such that when the keys are set, the ears 12 are lifted sufficiently to clear the ends of the stop lugs 1| thereby permitting rotation of the adding units when the handle is operated. Preferably the type segments and adding units are mounted in condensed form, for compact; printing by the type, and, since the columns of keys are spaced farther apart than is required for the type segments, the rear ends of the stop levers 31 are bent inward to bring the ears 12 thereof into cooperative relation with the adding unit stop lugs 1|.

The driver elements 69 are disc-like or sectorlike and are secured to hubs 13. These are formed with pulley grooves, and driving springs 14 pass over the hubs and engage pins 15 secured to the respective driving elements 69, as indicated in Fig. 2. The opposite ends of the springs 14 are carried forward and anchored to a cross bar 11 extending between the side plates and 6 and supported thereby. By this arrangement the driver or type sectors 69, and hence the adding units, are urged forward by the springs, but are normally prevented from forward movement by a bail hereinafter described. Depression of keys in the keyboard frees the units for forward movement by lifting the stop levers 31. The hubs 13 of the type segment driving elements 69 extend a short distance on the right side of the latter to form bearing shoulders 18 upon which adding sectors 19 are rotatably mounted. Said sectors 19 have arcuate slots 88 concentric with the shaft 68 and spaced therearound, and the driving elements 69 have headed rivets 8| extending through said slots and securing the adding sectors to the respective driving elements for independent rotation to the extent of one unit. Springs 82 resiliently connect together the driving elements and the adding sectors, the arrangement being such that the springs are adapted to move the adding sectors for transfer of tens, as more fully described hereinafter.

The movements of the adding units. after the stop levers 31 have been positioned by setting keys, are determined by the tail stops of the respective keys. For this purpose, the adding sectors 19 are provided with pivot studs 83 to which links 84 are pivotally connected. The opposite ends of the links 84 are pivotally connected by bolts 85 with stop slides 86 which are provided with stop lugs 81 adapted to engage the tail stops i 28 of the key stems |9. 'Ihe stop slides have elongated slots 88 and 89 cooperating with annular grooves in transversely extending rods 9| supported in the frame plates 5 and 6. The arrangement being such that the slides are held in proper spaced relation and are freely slidable for differential positioning of the respective adding units according to the setting of the keys. A transverse rod 9|*l is supported in the frame plates 5 and 6 and serves as an abutment engageable by depending tail portions of the slides to prevent the slides being accidentally moved out far enough to disengage the slots 89 from the rod 9|.

The pins or bolts of the links 84 are slidably mounted in the forward ends of the slots 88 of the respective stop slides 86 so as to permit relative longitudinal movement therebetween. Said pins are held normally at the forward ends of the slots by means of springs 92 connected at one end to the links and at the opposite end to the slides. This arrangement provides a safety device to prevent injury to the machine in case a key is accidentally depressed during the return stroke of the operating handle. If that should occur one of the stop lugs 81 would engage the front side of a key tail stop 28 and thus prevent the return of the corresponding stop slide 86 with its associate adding sector 19, which, as hereinafter described, is adapted to be returned to normal position when the driving elements 69 are returned by the pick-up bail, but this would merely stretch the spring and as soon as the return of the handle released the key the spring would snap the stop slide back to normal position.

The lugs 81 on the stop slides 86 are in staggered arrangement along the slides in order to cooperate with the staggered tail stops 28 of the keys. The upper or rear stops on the stop slides 86, instead of being upwardly projecting lugs as at 81, are shoulders 95 and 96 on a foldedover angle projection on the stop slides. The stop slides are mounted in the machine at an angle of thirty degrees to the horizontal so as to slide in parallel relation to the under side of the keyboard unit, and the stop lugs 81 are disposed to clear the stop tails of the keys when the keys are in normal retracted position.

I'he adding sectors 19 are provided with segmental racks |01 concentric with the main shaft 88 and adapted to engage accumulators or register wheel pinions |88. These are rotatably mounted on a transverse rod or shaft |89 the ends of which are supported in the side bars |8 of the accumulator rock frame. 'I'he register wheels have hubs projecting from the left of the wheels and each wheel is flanked at its left side by a disk ||2. Each hub bears a single tooth ||4. These teeth form triggers for operating carrying levers or pawls in the transfer of tens. Said triggers are preferably slanting on one face and straight on the other and adapted to cooperate with ratchet-tooth-like noses ||5 at the forward ends of carrying levers I9. These levers are pivotally mounted on a transverse shaft 1 supported in the accumulator unit side bars ||8 and therefore are movable with the register wheels when the latter are moved out of and into engagement with the adding sector racks |81. The rear ends of the carrying levers have laterally projecting ears H9 adapted to cooperate with forwardly projecting detent fingers |28 formed on the lower extremities of the respective adding sectors to limit return movement of the latter and control transfer of tens. The accumulator rock frame is mounted' on a transverse rock shaft I2| the ends of which are pivotally supported' in themain side frame plates 5 and The accumulator unit is adapted to be rocked with the pivot shaft I2| for moving the register wheels into and out of' mesh with the adding sector racks IM.

The noses H5 of the carrying levers IIS have bevel forward faces for cooperation with the triggers lltA as the register wheels |533 are rotated during normal addition. Opposite the cam faces, the tooth-like noses H5 are straight and substantially radial as to the register wheels, to form detent latches for engaging corresponding radial faces on the triggers I I when the register wheels are rotated in the opposite direction to re-set the accumulatore to Zero or take the total. When the register wheel pinions |98 are rotated more than nine units, during addition, the triggers lill will engage the bevel faces on the ends oi' the carrying levers Il@ and move the latter so that the opposite ends thereof will be moved out of the eld of the detent ngers im, thereby permitting the respective next higher order adding sectors to move forward an additional unit space under the pull of the transfer springs t2, for transfer of tens. Frequently the adding sectors and hence the detent fingers will not have returned to normal position at the time the carrying levers are tripped by the triggers llt. Therefore, means are provided for holding the carrying levers IIS in tripped position until the transfer of tens takes place. The carrying levers are provided with depending arms |24 having laterally projecting ears |275, adapted to cooperate with latch lugs or notches |26 on latch pawls B27. These pawls are pivotally mounted on a transverse shaft |28 supported in the side bars il@ of the accumulator rock frame. Double-acting springs |29 are provided for holding the carrying levers in position to be engaged by the triggers IM. The springs are anchored to the carrying levers and to the latch pawls and also serve to hold the latch pawls in engagement with the ears |25 when the carrying levers are displaced by the triggers.

After transfer of the tens, at the end of a return stroke of the handle, it is necessary to reset the carrying levers I I6 for transfer of tens on the next return stroke of the'handle, and this is done during the forward stroke of the handle. When the accumulator rock frame is moved downwardly to disengage the register wheel pinions IBB from the adding sector racks I'I, the outer ends |32 of the latch pawls |21 are adapted to engage a transversely disposed fixed rod |33 which will lift the latches and thereby release the transfer levers IIS and permit them to return to normal position by the pull .of the springs |29, provided the detent fingers |20 have been pushed back.

During the positioning movements of the adding sectors, the register wheel pinions are moved out of mesh with the adding sector racks |61 and, therefore the register wheels, being freely rotatable, are liable to become displaced. To avoid this, fixed detents |34 are mounted below the register wheels to engage the respective register wheels when the latter are moved out of mesh with the adding sectors. These detents are mounted on transverse rods supported by and between the main frame plates 5 and 5. The detents have upwardly projecting tooth-like noses to enter between the teeth of the respective register wheels. In order to limit the rocking movements of the accumulator unit the rock frame side bars I I0 are provided with forked forward ends, the lower fingers |38 being engageable with a xed transverse rod ISS supported in the main frame plates 5 and 6, to limit movement of the pinions toward the adding sector racks. The upper forwardly extending ends |338L of the side bars Ill) are engageable with the bar |39 to limit the movement of the accumulator rock frame when the register Wheels are withdrawn from the adding sectors. The side bars Htl are secured rigidly together by transverse rods |40.

In the present instance there are ten of the type bands l! mounted upon the respective driving segments E9 and each bearing a vertical series or column of type characters facing rearwardly. Fig. 7 is a rear face view of the type bands and type. The characters of the four columns it@ at the left, with reference to Fig. 7, are amount characters, from 0 to 9 inclusive and their set-up for listing or recording is controiled by the keys i8 of the right-hand bank in the keyboard. The second column lili from the left in Figure 7 includes decimal points. The type band immediately to the right of said four series bears, along its lower portion, a short column le@ of amount type characters from l to 5 inclusive. The upper portion of said band also bears a short column of type characters 10d and including A, B and CJ The selective set-up of these letter characters for printing is controlled by the keys IBC. The different letters may be employed to designate clerks or salesmen, for example, while the amount characters sharing the same type band with the letter characters, together with the series of amount characters ma at the left thereof in Figure '7 may be employed for printing dollars and cents. The purpose of said short series of amount characters is solely for printing the .overflow or carry-over from the columns at the left, with reference to Fig. 7, when a total is taken.

The type band immediately to the right in Figure 'l of the band bearing the short column of amount characters and letter characters bears a series of commodity-identifying type characters We whose set-up for printing is controlled by the keys Mld. The three type bands immediately to the right in Figure 7 of the last-mentioned band bear columns of amount type characters 'mf whose set-up for printing is controlled by the keys Ita on the keyboard. The first of said three columns includes the characters l to 9 inclusive, with a decimal point before each character. The two following columns include the characters 0 to 9 inclusive. At the right in Figure 7 of said three columns the final type band has a column '19g of amount type, characters l to "9 inclusive, whose purpose is solely that of printing the overilow or carry-over from the three columns immediately at the left 'thereof, with reference to Fig. '7, in total taking.

With reference again to Fig. '7, there are six columns of characters having zeros and the zeros are located at *the upper ends of the respective type bands and in horizontal alinement across the type assembly. Suitable known Zero-eliminating means may be provided to prevent printin g of the third, fourth, fifth or sixth zero, `from the left, with reference to Fig. '7, when no number is set up in an adjacent column lof higher denomination. Such an eliminating means is not illustrated as it forms no part of the present invention. The two zeros in the cents columns, at the left in Fig. 7, may be allowed to remain in position for printing at each operation of the machine for listing and also for total-printing. The topmost type character in the commoditydesignating series e is also located at the same level as the zeros and provision is made to prevent printing therefrom, when its respective control key is not set. To that end, the particular driving member 09 which bears the commodity type characters has its stop, which cooperates with one of the stops 12, set in advance of the stops 1| of the other members 63, as indicated at 1|a. When the operating handle of the machine is swung forward for a printing operation all of the members 09 are operated by the springs 14 to swing the type bands 10 upward toward printing position. The said forwardly set stop 1|a however engages its respective stop 12 early in its movement so that the stop 12 prevents movement of the topmost commodity type to the printing point. The topmost of the A, B, C types is located below the level of the zero types so that no mechanism is required to prevent the topmost letter type from printing when its control key is not set. As will be seen in Fig. 1 there is also a gap, one character space in length, between the lowermost letter type and the first of the amount types sharing the type band with the letter types.

At the rear of the type segments there is a platen lill. The printing paper is trained around the platen and the platen is rockably supported to move the paper thereon against the inking ribbon R', indicated in Fig. 2, and press the ribbon against the type for printing. The platen is rotatably mounted between frame side plates |42 which are secured together by transverse stay rods to form a rock frame which is mounted upon a transverse rock shaft m0, borne by the main frame side plates 5 and 6. The platen frame plates |42 have forwardly projecting lugs |52 to engage a fixed transverse rod |53 mounted in the main frame plates 5 and 8 for limiting rearward movement of the platen. The lower extremities of the platen frame plates |42 are formed as stop ngers |55 to cooperate with a transverse stop rod |55 to limit movement of the platen toward the type segments. By means such as disclosed in the aforesaid patent, the platen may be rocked toward the type segments i'or printing when the operating handle is swung on its forward stroke, and swung away from the type segments when the handle is swung on its return stroke. Suitable means, such as disclosed in said patent, may be provided for training the paper around the platen and for rotating the platen for line-space feeding of the paper.

As previously described herein, one of the type sectors bears both the letter characters A, B and C and the amount characters l to 5 inclusive, the selective set-up of said letter characters for printing being controlled by the setting of the non-accumulating keys |86, and the set-up of said amount characters being controlled by the accumulating means which cooperate with the right-hand bank of keys. In order to accommodate the machine to the improved keyboard and to the location of said letter characters and amount characters upon a common type segment the adding and accumulating means are modified over those disclosed in the aforesaid patent.

The adding sector associated with said type sector which bears both letter type and amount type has a rack |01a provided with fewer teeth than the racks |01 of the adding sectors to the right thereof. In the present instance there are twelve teeth upon said racks |01 and only seven complete teeth upon the rack |0'1a. The teeth upon the rack |011a include an uninterrupted row of i'iVe complete teeth |01b extending inward from the forward end of the rack and one complete tooth |01c at the rear end of the rack. At the inner side of said row of teeth and at the inner side of said single tooth there is also a tooth stub |01i of slight depth. Between said stubs there is a gap |01e. This gap is so located that when the rack |01 is in normal position the rear portion of gap will be directly over the associated register wheel |08. The length of the gap is sufficient to permit movement of the rack to a degree permitted by setting of any one of the letter keys I0c without rotation of the register wheel by the rack. That renders said keys recording keys only; they cause no accumulator operation. When, however, the rack is released and moved forward by its spring 82 to carry over a ten, the tooth |01c will rotate the register pinion |08 one tooth space to accumulate the ten upon the pinion. The tooth stubs |01d are merely to aid meshing of the teeth |01 b and |01c with the teeth of the register wheel,

Means are provided for positively limiting accumulating rotation of the register pinion |08,

associated with the mutilated rack |01a in accordance with the limited amount-printing capacity of the associated type segment. Means are also provided to hold said pinion against accidental rotation. Mounted forward of the register wheels |08 there is a bracket 384 formed of a strip of stiff sheet metal bent to provide it with a straight medial portion 385 extending transversely of the machine, a rearwardly and upwardly extending left arm portion 388 and a similarly extending right arm portion 381. The left arm has an aperture registering with an aperture in the forward end portion of the lefthand accumulator frame plate I0 and a bolt 388 is passed through said aperture and has a nut screwed thereon, to secure the bracket 384 to said frame plate. The left arm of the bracket is also formed with a finger 383 extending rearwardly and upwardly beyond the screw hole and bent to the left, as at 390, to engage the upper edge of said plate I0 and prevent turning of the bracket clockwise, with reference to Figs. 2 and 4. The right arm 381 of the bracket bears a headed screw 39| upon which a detent pawl 392 is pivoted intermediate its ends. This pawl is located directly in front of the register pinion |08 which is associated with the mutilated rack |013, and the lower end of the pawl is rounded, as at 393, and formed to fit between adjacent teeth of the register pinion to hold the latter against rotation. A spring 394 connects the upper end of the' pawl to an upwardly extending lug 395 formed on the arm 381 of the bracket and acts to yieldably hold the pawl in retaining engagement with the register pinion. The pinion is thereby held against acci- (llerital rotation but it may be rotated by the rack Bracket arm 381 is also formed with a rearwardly and upwardly extending finger 398 having at its extremity a downwardly depending stop tooth 391. Said stop tooth is disposed in the path of the trigger tooth ||4 fixed to rotate with said pinion. Normally, when the adding machine is clear the trigger is in engagement with the rear side of the nose 5 of the associated carrying lever IE5. Asthe pinion is rotated for accumulation of carried-over tens the trigger is moved until it and the pinion are nally stopped by engagement of the triggerwith the stop tooth-391. The latter is disposed to positively limit the` rotation of the pinion to five tooth spaces, for accumulating ve tens, that niunber corresponding to the number of amount type characters borne by the type segment which also bears the letter characters A, B and 0.

In order to further adapt the adding mechanism to the improved keyboard said mechanism is designed to prevent vaccumulating action by the particular sector 1S which is under the control of the commodity keys ldd. To. that end no register pinion is provided for cooperation with said sector. That renders the keys iSd recording keys only; they cause no accumulator operation. Also, as previously pointed out, the adjacent pinion to the right, which cooperates with the mutilated rack lt'l-EL has its accumulating rotation limited to five tooth spaces. Consequently its trigger H4 can never move far enough to trip the particular transfer lever associated with the` said Commodity sector i9 so that transfer movement of` the sector is prevented. Y

Y Near the upper right-hand corner of the keyboard there is a total key 253. At the right-hand side of the keyboard there isja clear key 265, marked Chg four ,oharging.rv spaced downwardly alongside the keyboard ,from said clear key, there is also a non-print key 23d.

AThe general operating handleof the machine is designated 96, It is detachably affixed to the right-hand end of the main shaft 63 and normally occupies a rearwardly/'swung position, A universal rock bail, or adding unitpick-up bail 29'4 is rotatably mounted upon aV medial portion of the shaft and is normally located in front of the shaft in position to cooperate with noses or stop edges 225 carriedmby andkformecl aspart of Vthe type sector discs tt. The latter, as previously pointedout, form the drive elements of the adding units. In responseto forward movement of the handle the pick-up bail will be moved counter-"clockwise, as viewed in Fig. 2 by means disclosed the aforesaid patent. lThis willpermit the adding sector `units to move forward differentially according to the setting of the keys in theke'yboard. When the handle returns, the bai1'294 will pick up the respective adding units, by engaging the noses 295 and restore the driving lelements 89 tok normal position against the action of their springs I4. The movements of the handle and the bail will be controlled by suitable means such as disclosed inthe aforesaid patent. Y o v In the operation of the` machine it may be assumed, for illustration, that it is `desired to record a transaction including the salerof five and one-half gallonsy of gasoline vby a salesman identified by the letter B and for the amount of $1.25. The following keys Vare depressed: The key in Ythe units column` of the left hand bank ofthe keyboard, the key v5. in the decimal column of said bank, the key Gas in the commodity column and the appropriate keys 1, 2 and 5 in the dollars and cents columns of the right-hand bank of the keyboard. Depression of these keys disposes their stop tails in the Vpath of the appropriate stops 81 on the appropriate slides andalso elevates they proper stops 12 to free the appropriate adding sectors and type sectors for movement. When the AoperatingA handle is swung forward VVthe accumulator unit will, by means such as disclosed inthe aforesaid patent, be rocked downward to demesh the register wheels |58 from the racks of the adding sectors, and the bail 294 will be rocked to permit the freed adding sectors and type sectors to move counter-clockwise, as viewed in Fig. 2, as far as the stop tails of the set keys will permit. Thereby the appropriate type will be brought to printing position. The forward movement of the handle, by means such as disclosed in the aforesaid patent, causes the platen to be swung for- Ward and it reaches printing position when the handle is at or near the limit of its forward movement. Thereby the amount of the commodity sold, the identification of the commodity, the identication of the salesman and the monetary amount of the transaction are all printed in one line across the paper.

When the handle starts its return movement the accumulator unit, by means such as disclosed in the aforesaid patent, is caused to rock upward and bring the register pinions H38 into mesh with the racks mi. As Ythe handle swingskrearward the bail 294 is caused to swing clockwise, as viewed in Fig. 2, and the bail restores the type sectors 69 and the adding sectors 'I9 and their racks to normal position thereby causing the adding racks to rotate the register pinions and accumulate the amounts thereon.

When the totals are to be taken the handle is rst moved through an idle forward stroke and return stroke. That is in order to restorek to normal position any of the transfer levers H6 which may have been latched out by the precedi ing adding and listing operations of the machine,

in normal position and hold the register pinions` in mesh with the racks |81 as the handle is swung forward. Thereby the adding sectors and type sectors are placed under control of the accumulating means to set up the type for printing the totals, the racks rotating the pinions clockwise to bring their triggers lill back into engagement with the rear sides of the noses l I5 of the transfer levers H5, thereby clearing the machine. Means such as disclosed in the aforesaid patent Hcause the accumulator unit to be rocked downward to move the register pinions out of mesh with the racks when the handle is started on its return stroke after total printing. Y Near the end of the return stroke the accumulator unit is rocked upward to remesh the pinions with the racks. As the handle is returned, the bail 294 is rocked to restore the adding sectors and type sectors to normal position.

If, when a tota-l is taken, no tens have been transferred for printing by the amount type borne by the type segment which also bears the clerk-identifying letters, Fig. '7, said segment will be rocked upwardly to bring the gap between said letter types and said amount types to the printing point so that no printing willbe done from this segment. Said idle rocking of thel segment is permitted by the gap IIIe in the associated` multilated rack |813. Operation of the total key causes all of the stops 'I2 to be lifted to inoperative position by means disclosed in the aforesaid.

patent. Consequently, since the gap Hl'le in said rack is normally over the associated register pinion |08, the pinion has no control over the rack until the rack moves sufficiently to bring one of the rack teeth Ill'lb into mesh with the teeth of the pinion. Since the trigger ||4 xed to the pinion is then against the rear side of the nose ||5 of the associated lever ||6 the pinion is locked against clockwise rotation and it in turn limits the movement of the rack, the adding sector and the type segment. The rack is so designed as to stop the type segment in a position with said gap therein at the printing point. If, on the other hand, tens have been transferred to said register pinion the trigger will have been moved counter-clockwise away from its stop ||5. Then, for total printing the rack teeth lillu will rotate the register pinion back until the trigger reengages its stop H5 and the type segment will thereby be stopped in position for printing from the proper amount type.

When a credit sale is made and it is desired not to include the amounts in the total the charging key 260 is depressed and the handle swung forward and back. On the forward stroke of the handle the machine will operate as in adding and listing. On the return stroke, however, by means such as disclosed in the aforesaid patent, the accumulator unit will be rocked downward, after momentarily rocking upward at the beginning of the return stroke of the handle, to shift the register wheels out of mesh with the racks and prevent accumulations of the numbers set up on the keyboard. The numbers however will be printed in the usual Way.

It is sometimes desirable to eliminate the printing operation. In that case the non-print key 236 is depressed. By means such as disclosed in the aforesaid patent, the means for rocking the platen to printing position are disabled so that the platen remains in its rearwardly swung position.

In order to take a sub-total the handle is moved through a forward idle stroke and back. Then the total key 253 is pressed rearward and the handle is swung on a forward stroke and a return stroke. By metans controlled by said key, and such as disclosed in the aforesaid patent, for example, the accumlator unit may be controlled to mesh the register pinions |08 with the racks lill during both the forward stroke and the return stroke of the handle. Clearing of the machine is thereby prevented.

What I claim is:

l. In a key-set adding and listing machine including a shiftable adding rack, a bank of amount keys settable selectively to limit shift of said rack differentially, and a shiftable type carrier bearing amount types appropriate to said keys and responsive to shift of said rack to set one of said types, appropriate to a set one of said keys, in preperation for printing, in combination, a shiftable mutilated higher-order rack, a special designation key settable to limit shift of said higher-order rack, a shiftable higher-order type carrier bearing a lesser number of amount types than said first carrier, for extended total printing only, and also bearing a special designation type appropriate to said special designation key, said higher-order carrier being responsive to shift of said higher-order rack as limited by said special designation key setting to set said special designation type in preparation for printing, a lower-order accumulator pinion and a higher-order accumulator pinion shiftable into and out of mesh with said first rack and said higher-order rack respectively, the higher-order rack having certain of its pinion-rotating teeth omitted in accordance with said lesser number of amount types, to prevent rotation of the higher-order pinion in the shift of the higher-order rack between the limit determined by the setting of said special designation key and the normal position of the rack, and means to actuate the higher-order rack for carrying over tens from the lower-order pinion to the higher-order pinion.

2. In a key-set adding and listing machine of the class described having a shiftable adding rack, a column of amount keys settable selectively to limit shift of said rack differentially, and a shiftable type carrier bearing amount types appropriate to said keys and responsive to shift of said rack to set one of said types, appropriate to a set one of said keys, in preparation for printing, in combination, a shiftable higherorder rack, a shorter column of special designation keys at the left of said first column and settaie selectively to limit differentially shift of said higher-order rack, a lower-order accumulator pinion and a higher-order accumulator pinion engageable with said racks for adding and total taking operations, a shiftable higher-order type carrier bearing a lesser number of amount types than said rst carrier, for extended total printing only, and also bearing special designation types appropriate to said special designation keys, said higher-order carrier being responsive to shift of said higher-order rack to set one of said special designation types appropriate to any set one of said special designation keys in preparation for printing, the latter rack having a gap in its series of teeth reducing the number of teeth, for the purpose set forth, and so located on the rack and of such extent as to avoid rotation of the higher-order pinion by the higher-order rack in the shift of the latter between the limit determined by the setting of any one of said special designation keys and the normal position of the rack, and means coactive with the higher-order rack to control the latter automatically to carry tens from the lowerorder pinion to the higher-order pinion, said higher-order` rack tooth series comprising a tooth at one side of said gap to mesh with said higherorder pinion for carry-over and teeth at the opposite side of the gap to mesh with the higherorder pinion for total-taking.

3. In a key-set adding and listing machine as claimed in claim 2, means to positively limit rotation of said higher-order pinion in accumulating direction to prevent accumulation thereby of a number of tens exceeding the number of amount types on the higher-order type carrier, and yieldable detent means to prevent accidental rotation of the higher-order pinion while the gap in the tooth series of the higherorder rack is opposed to said pinion.

CHARLES H. BRADT. 

